/* ================= Tokens ================= */
@property --angle {
  syntax: "<angle>";
  initial-value: 0deg;
  inherits: false;
}

:root {
  --bg: #000;
  --panel: rgba(10, 14, 20, .72);
  --panel-solid: #080b10;
  --raise: rgba(255, 255, 255, .035);
  --line: rgba(255, 255, 255, .08);
  --line-strong: rgba(255, 255, 255, .18);
  --text: #e8f1f5;
  --muted: #7f8d9b;
  --cyan: #00e5ff;
  --violet: #7c5cff;
  --green: #2bffa3;
  --pink: #ff3d7f;
  --amber: #ffc24b;
  --line-h: 32px;
  --font-display: "Sora", "Segoe UI", system-ui, sans-serif;
  --font-body: "Manrope", "Segoe UI", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --ease-out: cubic-bezier(.16, 1, .3, 1);
  --glow-cyan: 0 0 0 1px rgba(0, 229, 255, .35), 0 0 24px -4px rgba(0, 229, 255, .55);
}

* { box-sizing: border-box; }
html, body { margin: 0; }

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
::selection { background: rgba(0, 229, 255, .35); color: #fff; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.fx-defs { position: absolute; width: 0; height: 0; }

/* ================= Background ================= */
.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
  background: #000;
}
.bg-glow {
  position: absolute;
  width: 60vmax;
  height: 60vmax;
  border-radius: 50%;
  filter: blur(90px);
  opacity: .32;
  will-change: transform;
}
.g1 {
  top: -25vmax; left: -15vmax;
  background: radial-gradient(circle, var(--violet) 0%, transparent 65%);
  animation: drift1 22s ease-in-out infinite alternate;
}
.g2 {
  bottom: -30vmax; right: -20vmax;
  background: radial-gradient(circle, #0077ff 0%, transparent 65%);
  animation: drift2 26s ease-in-out infinite alternate;
}
@keyframes drift1 { to { transform: translate(18vw, 14vh) scale(1.15); } }
@keyframes drift2 { to { transform: translate(-16vw, -12vh) scale(1.2); } }

.bg-grid {
  position: absolute;
  left: -50%;
  right: -50%;
  bottom: 0;
  height: 60%;
  transform-origin: 50% 100%;
  transform: perspective(420px) rotateX(60deg);
  background-image:
    linear-gradient(rgba(0, 229, 255, .35) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, .35) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(to top, #000 0%, rgba(0, 0, 0, .6) 35%, transparent 80%);
  mask-image: linear-gradient(to top, #000 0%, rgba(0, 0, 0, .6) 35%, transparent 80%);
  opacity: .55;
  animation: grid-run 2.4s linear infinite;
}
@keyframes grid-run { to { background-position: 0 64px, 0 0; } }

.bg-spot {
  position: absolute;
  inset: 0;
  background: radial-gradient(520px circle at var(--cx, 50%) var(--cy, 30%), rgba(0, 229, 255, .09), transparent 60%);
  transition: background .2s linear;
}
.bg-scan {
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(to bottom, rgba(255, 255, 255, .025) 0 1px, transparent 1px 3px);
  mix-blend-mode: overlay;
}

/* ================= Top bar ================= */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px max(24px, calc((100vw - 1160px) / 2 + 24px));
  backdrop-filter: blur(12px) saturate(140%);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  background: linear-gradient(to bottom, rgba(0, 0, 0, .75), rgba(0, 0, 0, .25));
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: none;
  border: 0;
  padding: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: .02em;
  color: var(--text);
}
.brand::before {
  content: "";
  width: 14px;
  height: 14px;
  border: 2px solid var(--cyan);
  transform: rotate(45deg);
  box-shadow: 0 0 12px rgba(0, 229, 255, .7), inset 0 0 6px rgba(0, 229, 255, .6);
  animation: spin-slow 8s linear infinite;
}
@keyframes spin-slow { to { transform: rotate(405deg); } }

.topbar-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--raise);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--text);
  transition: border-color .2s, box-shadow .2s;
}
.topbar-btn:hover { border-color: var(--cyan); box-shadow: var(--glow-cyan); }

.status-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--muted);
}
.status-dot.on {
  background: var(--green);
  box-shadow: 0 0 10px var(--green);
  animation: blink 2s ease-in-out infinite;
}
@keyframes blink { 50% { opacity: .35; } }

main {
  max-width: 1160px;
  margin: 0 auto;
  padding: 8px 24px 96px;
}
main:focus { outline: none; }

/* ================= Home ================= */
.home-head {
  max-width: 760px;
  margin: 48px 0 32px;
}
.home-head h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 1;
  letter-spacing: -.01em;
  margin: 0 0 18px;
  background: linear-gradient(100deg, #fff 0%, #cfefff 40%, var(--cyan) 70%, var(--violet) 100%);
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: sheen 8s ease-in-out infinite alternate;
}
@keyframes sheen { to { background-position: 100% 0; } }
.home-head p { margin: 0; color: var(--muted); max-width: 56ch; }

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  margin: 26px 0 0;
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--muted);
}
.stats b {
  display: block;
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.1;
}

.ai-note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  margin: 0 0 40px;
  padding: 12px 16px;
  border: 1px solid rgba(255, 194, 75, .35);
  background: rgba(255, 194, 75, .06);
  border-radius: 12px;
  font-size: .95rem;
  max-width: 780px;
}
.ai-note p { margin: 0; flex: 1 1 320px; color: #f1e3c4; }

.deck-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
  perspective: 1000px;
}

/* Deck tile */
.deck {
  --rx: 0deg;
  --ry: 0deg;
  --mx: 50%;
  --my: 50%;
  position: relative;
  display: block;
  width: 100%;
  padding: 1px;
  border: 0;
  border-radius: 16px;
  background: var(--line-strong);
  text-align: left;
  color: var(--text);
  transform: rotateX(var(--rx)) rotateY(var(--ry));
  transform-style: preserve-3d;
  transition: transform .25s var(--ease-out), box-shadow .3s;
  animation: rise-in .9s var(--ease-out) both;
  animation-delay: calc(var(--i, 0) * 70ms + 250ms);
}
.deck::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: conic-gradient(from var(--angle), transparent 0 60%, var(--cyan) 75%, var(--violet) 85%, transparent 95%);
  opacity: 0;
  transition: opacity .3s;
  animation: orbit 3s linear infinite;
}
@keyframes orbit { to { --angle: 360deg; } }
.deck:hover::before, .deck:focus-visible::before { opacity: 1; }
.deck:hover, .deck:focus-visible { box-shadow: 0 20px 60px -20px rgba(0, 229, 255, .45); }
.deck:focus-visible { outline: none; }

@keyframes rise-in {
  from { opacity: 0; transform: translateY(40px) scale(.96); filter: blur(14px); }
  to { opacity: 1; transform: none; filter: blur(0); }
}

.deck-face {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 196px;
  padding: 20px 20px 18px;
  border-radius: 15px;
  background:
    radial-gradient(300px circle at var(--mx) var(--my), rgba(0, 229, 255, .12), transparent 55%),
    linear-gradient(160deg, #0d1219, #05070a);
  overflow: hidden;
}
.deck-top {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: auto;
}
.deck-count-big {
  font-family: var(--font-display);
  font-size: 2.6rem;
  font-weight: 600;
  line-height: 1;
  color: #fff;
  text-shadow: 0 0 22px rgba(0, 229, 255, .45);
}
.deck-unit {
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--muted);
}
.deck-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.3rem;
  letter-spacing: .01em;
  line-height: 1.2;
  margin-top: 18px;
}
.deck-blurb {
  font-size: .9rem;
  color: var(--muted);
  line-height: 1.4;
}
.region-bar {
  display: flex;
  gap: 3px;
  height: 4px;
  margin-top: 14px;
}
.region-bar i {
  display: block;
  border-radius: 2px;
  background: var(--cyan);
  opacity: .85;
  transform-origin: left;
  animation: bar-grow 1.1s var(--ease-out) both;
  animation-delay: calc(var(--i, 0) * 70ms + 650ms);
}
.region-bar i:nth-child(6n+2) { background: var(--violet); }
.region-bar i:nth-child(6n+3) { background: var(--green); }
.region-bar i:nth-child(6n+4) { background: var(--amber); }
.region-bar i:nth-child(6n+5) { background: var(--pink); }
.region-bar i:nth-child(6n+6) { background: #4da3ff; }
@keyframes bar-grow { from { transform: scaleX(0); } }

.shine {
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 30%, rgba(255, 255, 255, .09) 45%, transparent 60%);
  transform: translateX(-120%);
  pointer-events: none;
}
.deck:hover .shine { transform: translateX(120%); transition: transform .9s var(--ease-out); }

.deck.mixed .deck-face {
  background:
    radial-gradient(300px circle at var(--mx) var(--my), rgba(124, 92, 255, .2), transparent 55%),
    linear-gradient(160deg, #130f24, #05060b);
}
.deck.mixed .deck-count-big { text-shadow: 0 0 22px rgba(124, 92, 255, .7); }

/* ================= Panels ================= */
.sheet {
  position: relative;
  max-width: 800px;
  margin: 18px auto 0;
  background: var(--panel);
  border: 1px solid var(--line-strong);
  border-radius: 18px;
  backdrop-filter: blur(16px) saturate(130%);
  -webkit-backdrop-filter: blur(16px) saturate(130%);
  box-shadow: 0 30px 80px -30px rgba(0, 0, 0, .9), inset 0 1px 0 rgba(255, 255, 255, .06);
  will-change: transform, opacity;
}
.sheet::before {
  content: "";
  position: absolute;
  left: 18px; right: 18px; top: -1px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), var(--violet), transparent);
  background-size: 200% 100%;
  animation: flow 3.5s linear infinite;
}
@keyframes flow { to { background-position: -200% 0; } }

.sheet-head {
  padding: 24px 30px 18px;
  border-bottom: 1px solid var(--line);
}
.sheet-body { padding: 24px 30px 30px; }

.kicker {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--cyan);
}
.sheet-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  letter-spacing: 0;
  line-height: 1.1;
  margin: 0;
}

.back-link {
  background: none;
  border: 0;
  padding: 4px 0;
  font-family: var(--font-mono);
  font-size: .85rem;
  color: var(--muted);
}
.back-link::before { content: "\2190  "; }
.back-link:hover { color: var(--cyan); }

/* ================= Setup ================= */
.setup-group { border: 0; margin: 0 0 24px; padding: 0; }
.setup-group legend, .field > span {
  display: block;
  padding: 0;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--muted);
}
.segmented { display: flex; flex-wrap: wrap; gap: 10px; }
.segmented label { position: relative; flex: 1 1 200px; }
.segmented input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.segmented .seg {
  display: block;
  height: 100%;
  padding: 14px 16px;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  background: var(--raise);
  transition: border-color .2s, box-shadow .25s, background .25s;
}
.segmented .seg strong { display: block; font-family: var(--font-display); font-weight: 600; font-size: 1.05rem; }
.segmented .seg small { color: var(--muted); font-size: .86rem; }
.segmented label:hover .seg { border-color: rgba(0, 229, 255, .5); }
.segmented input:checked + .seg {
  border-color: var(--cyan);
  background: linear-gradient(140deg, rgba(0, 229, 255, .14), rgba(124, 92, 255, .08));
  box-shadow: var(--glow-cyan);
}
.segmented input:focus-visible + .seg { outline: 2px solid var(--cyan); outline-offset: 3px; }

.field { display: block; margin: 0 0 20px; }
.field select, .field input {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: #05080c;
  color: var(--text);
}
.field select:focus, .field input:focus { border-color: var(--cyan); box-shadow: var(--glow-cyan); outline: none; }
.field input:disabled, .field select:disabled { opacity: .45; }
.field select option { background: #05080c; }

.setup-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-top: 8px; }

/* ================= Buttons ================= */
.btn-primary {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: 0;
  border-radius: 10px;
  background: linear-gradient(120deg, var(--cyan), #6fb6ff 60%, var(--violet));
  background-size: 160% 100%;
  color: #00080c;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: .02em;
  overflow: hidden;
  box-shadow: 0 8px 30px -8px rgba(0, 229, 255, .7);
  transition: transform .15s var(--ease-out), box-shadow .25s, background-position .5s;
}
.btn-primary::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 35%, rgba(255, 255, 255, .55) 50%, transparent 65%);
  transform: translateX(-130%);
}
.btn-primary:hover { background-position: 100% 0; box-shadow: 0 10px 40px -6px rgba(0, 229, 255, .9); }
.btn-primary:hover::after { transform: translateX(130%); transition: transform .7s var(--ease-out); }
.btn-primary:active { transform: scale(.97); }
.btn-primary:disabled { opacity: .4; cursor: not-allowed; box-shadow: none; }

.btn-plain, .btn-on-desk {
  padding: 11px 18px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: var(--raise);
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 600;
  transition: border-color .2s, box-shadow .2s;
}
.btn-plain:hover, .btn-on-desk:hover { border-color: var(--cyan); box-shadow: var(--glow-cyan); }
.btn-plain:disabled { opacity: .45; cursor: not-allowed; box-shadow: none; border-color: var(--line-strong); }

/* ================= Study ================= */
.study-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 800px;
  margin: 16px auto 0;
  font-family: var(--font-mono);
  font-size: .85rem;
  color: var(--muted);
}
.progress {
  position: relative;
  max-width: 800px;
  height: 4px;
  margin: 12px auto 0;
  background: rgba(255, 255, 255, .07);
  border-radius: 999px;
  overflow: hidden;
}
.progress > span {
  position: relative;
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--violet), var(--cyan));
  border-radius: 999px;
  box-shadow: 0 0 12px var(--cyan);
  transition: width .6s var(--ease-out);
}
.progress > span::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .8), transparent);
  animation: streak 1.6s linear infinite;
}
@keyframes streak { from { transform: translateX(-100%); } to { transform: translateX(100%); } }

.prompt {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.3rem;
  line-height: 1.3;
  margin: 0 0 18px;
}

.clues {
  margin: 0 0 20px;
  padding: 14px 18px 14px 36px;
  background: rgba(124, 92, 255, .08);
  border: 1px solid rgba(124, 92, 255, .3);
  border-radius: 12px;
}
.clues li { margin: 4px 0; }
.clues li::marker { color: var(--violet); }

/* Multiple choice */
.options { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.options li { animation: rise-in .6s var(--ease-out) both; }
.options li:nth-child(2) { animation-delay: 60ms; }
.options li:nth-child(3) { animation-delay: 120ms; }
.options li:nth-child(4) { animation-delay: 180ms; }

.option {
  position: relative;
  width: 100%;
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 14px;
  align-items: start;
  padding: 14px 16px;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  background: var(--raise);
  text-align: left;
  color: var(--text);
  transition: border-color .2s, background .25s, box-shadow .25s, transform .15s var(--ease-out);
}
.option:hover:not(.is-correct):not(.is-wrong) {
  border-color: rgba(0, 229, 255, .6);
  background: rgba(0, 229, 255, .05);
  transform: translateX(4px);
}
.letter {
  display: grid;
  place-items: center;
  width: 30px; height: 30px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: .85rem;
  color: var(--cyan);
}
.option-text { padding-top: 3px; }

.option.is-correct {
  border-color: var(--green);
  background: rgba(43, 255, 163, .08);
  box-shadow: 0 0 0 1px rgba(43, 255, 163, .3), 0 0 32px -8px rgba(43, 255, 163, .6);
  animation: lock-in .6s var(--ease-out);
}
.option.is-wrong {
  border-color: var(--pink);
  background: rgba(255, 61, 127, .08);
  box-shadow: 0 0 0 1px rgba(255, 61, 127, .3), 0 0 32px -8px rgba(255, 61, 127, .6);
  animation: glitch .45s steps(2, end);
}
.option.is-correct .letter { background: var(--green); border-color: var(--green); color: #00140b; }
.option.is-wrong .letter { background: var(--pink); border-color: var(--pink); color: #1a0009; }
@keyframes lock-in {
  0% { transform: scale(.98); filter: brightness(1.8) blur(2px); }
  100% { transform: none; filter: none; }
}
@keyframes glitch {
  0% { transform: translateX(0); filter: blur(0); }
  20% { transform: translateX(-8px); filter: blur(2px); }
  40% { transform: translateX(7px); filter: blur(1px); }
  60% { transform: translateX(-5px); }
  80% { transform: translateX(3px); }
  100% { transform: none; filter: none; }
}

.option-tag { font-family: var(--font-mono); font-size: .75rem; margin-left: 8px; }
.option.is-correct .option-tag { color: var(--green); }
.option.is-wrong .option-tag { color: var(--pink); }

.explain {
  grid-column: 2;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--line-strong);
  font-size: .95rem;
  line-height: 1.6;
  color: #c7d3dc;
  animation: unfold .35s var(--ease-out);
}
.explain[hidden] { display: none; }
@keyframes unfold { from { opacity: 0; transform: translateY(-6px); filter: blur(4px); } }
.explain-toggle-hint { font-family: var(--font-mono); font-size: .8rem; color: var(--muted); }

/* Free response */
.answer-box {
  width: 100%;
  min-height: calc(var(--line-h) * 6);
  padding: 0 16px;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  background:
    repeating-linear-gradient(to bottom, transparent 0, transparent calc(var(--line-h) - 1px), rgba(0, 229, 255, .08) calc(var(--line-h) - 1px), rgba(0, 229, 255, .08) var(--line-h)),
    #03060a;
  background-attachment: local;
  line-height: var(--line-h);
  color: var(--text);
  caret-color: var(--cyan);
  resize: vertical;
  transition: border-color .2s, box-shadow .3s;
}
.answer-box::placeholder { color: #4e5b68; }
.answer-box:focus { border-color: var(--cyan); box-shadow: var(--glow-cyan); outline: none; }
.answer-box:disabled { opacity: .7; }
.answer-hint { font-family: var(--font-mono); font-size: .78rem; color: var(--muted); margin: 8px 0 18px; }

.row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

.checking {
  position: relative;
  margin-top: 20px;
  padding: 16px 18px;
  border: 1px solid rgba(0, 229, 255, .35);
  border-radius: 12px;
  font-family: var(--font-mono);
  font-size: .85rem;
  color: var(--cyan);
  overflow: hidden;
}
.scanner {
  position: absolute;
  top: 0; bottom: 0;
  width: 30%;
  background: linear-gradient(90deg, transparent, rgba(0, 229, 255, .25), transparent);
  filter: blur(6px);
  animation: scan 1.1s ease-in-out infinite alternate;
}
@keyframes scan { from { left: -30%; } to { left: 100%; } }

.result { margin-top: 24px; animation: rise-in .6s var(--ease-out) both; }
.verdict {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
}
.verdict .num {
  font-size: 3rem;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.verdict.good { color: var(--green); }
.verdict.mid { color: var(--amber); }
.verdict.bad { color: var(--pink); }
.verdict.good .num { text-shadow: 0 0 28px rgba(43, 255, 163, .6); }
.verdict.mid .num { text-shadow: 0 0 28px rgba(255, 194, 75, .55); }
.verdict.bad .num { text-shadow: 0 0 28px rgba(255, 61, 127, .6); }
.meter {
  height: 4px;
  margin: 10px 0 6px;
  background: rgba(255, 255, 255, .07);
  border-radius: 999px;
  overflow: hidden;
}
.meter > span {
  display: block;
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: currentColor;
  transition: width 1s var(--ease-out);
}
.verdict-wrap.good { color: var(--green); }
.verdict-wrap.mid { color: var(--amber); }
.verdict-wrap.bad { color: var(--pink); }

.grader-note { font-family: var(--font-mono); font-size: .78rem; color: var(--muted); margin: 6px 0 16px; }

.feedback-block {
  margin: 12px 0 0;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--raise);
}
.feedback-block h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  margin: 0 0 6px;
}
.feedback-block ul { margin: 0; padding-left: 20px; }
.feedback-block li { margin: 3px 0; }
.fb-right { border-color: rgba(43, 255, 163, .3); }
.fb-right h3, .fb-right li::marker { color: var(--green); }
.fb-missed { border-color: rgba(255, 194, 75, .3); }
.fb-missed h3, .fb-missed li::marker { color: var(--amber); }
.fb-wrong { border-color: rgba(255, 61, 127, .35); }
.fb-wrong h3, .fb-wrong li::marker { color: var(--pink); }
.tip { margin: 12px 0 0; padding: 12px 16px; border-left: 2px solid var(--cyan); background: rgba(0, 229, 255, .05); border-radius: 0 10px 10px 0; }

.notes-block {
  margin-top: 20px;
  padding: 14px 18px;
  border: 1px dashed rgba(0, 229, 255, .35);
  border-radius: 12px;
  background: rgba(0, 229, 255, .03);
  animation: rise-in .6s var(--ease-out) .1s both;
}
.notes-block h3 { font-family: var(--font-display); font-weight: 600; font-size: 1rem; margin: 0 0 6px; color: var(--cyan); }
.notes-block ul { margin: 0; padding-left: 20px; }
.notes-block li::marker { color: var(--cyan); }

.next-row { margin-top: 24px; display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.kbd-hint { font-family: var(--font-mono); font-size: .78rem; color: var(--muted); }

.error {
  margin-top: 14px;
  padding: 10px 14px;
  border: 1px solid rgba(255, 61, 127, .4);
  background: rgba(255, 61, 127, .08);
  border-radius: 10px;
  font-size: .92rem;
  color: #ffd1df;
}

/* ================= Summary ================= */
.score-line {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.2rem, 7vw, 3.6rem);
  line-height: 1.05;
  margin: 0;
  background: linear-gradient(100deg, #fff, var(--cyan) 60%, var(--violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.missed-list { margin: 10px 0 0; padding-left: 20px; }
.missed-list li { margin: 5px 0; }
.missed-list li::marker { color: var(--pink); }

/* ================= Settings dialog ================= */
dialog {
  border: 0;
  padding: 0;
  background: transparent;
  max-width: min(560px, calc(100vw - 32px));
  width: 100%;
  color: var(--text);
}
dialog[open] { animation: dialog-in .45s var(--ease-out); }
@keyframes dialog-in { from { opacity: 0; transform: translateY(24px) scale(.97); filter: blur(10px); } }
dialog::backdrop { background: rgba(0, 0, 0, .7); backdrop-filter: blur(6px); }
.settings-card {
  position: relative;
  background: rgba(8, 11, 16, .92);
  border: 1px solid var(--line-strong);
  border-radius: 18px;
  padding: 26px 28px;
  box-shadow: 0 40px 100px -30px rgba(0, 229, 255, .35);
}
.settings-card h2 { font-family: var(--font-display); font-weight: 700; margin: 0 0 8px; font-size: 1.45rem; }
.muted { color: var(--muted); margin: 0 0 20px; }
.help { font-size: .9rem; margin: -6px 0 12px; color: #c7d3dc; }
.help a { color: var(--cyan); }
.warning { font-size: .85rem; color: #ff9cbc; margin: 0 0 20px; }
.dialog-actions { display: flex; justify-content: flex-end; gap: 12px; }

/* ================= Small screens ================= */
@media (max-width: 600px) {
  body { font-size: 16px; }
  .topbar, main { padding-left: 16px; padding-right: 16px; }
  .topbar { padding-left: 16px; padding-right: 16px; }
  .brand { font-size: 1rem; }
  .topbar-btn { white-space: nowrap; font-size: .74rem; padding: 6px 11px; }
  .sheet-head { padding: 18px 18px 14px; }
  .sheet-body { padding: 20px 18px 24px; }
  .home-head { margin-top: 28px; }
}

/* ================= Reduced motion ================= */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
  .deck { transform: none !important; }
  .bg-grid, .bg-glow { animation: none !important; }
}

/* ================= Fill in the blank + centralization ================= */
.cloze {
  margin: 0 0 22px;
  padding: 18px 20px;
  border: 1px solid rgba(124, 92, 255, .35);
  border-radius: 12px;
  background: rgba(124, 92, 255, .07);
  font-size: 1.12rem;
  line-height: 1.7;
}
.blank {
  display: inline-block;
  min-width: 6ch;
  padding: 0 8px;
  margin: 0 2px;
  border-bottom: 2px solid var(--cyan);
  color: transparent;
  background: linear-gradient(90deg, rgba(0, 229, 255, .05), rgba(0, 229, 255, .18), rgba(0, 229, 255, .05));
  background-size: 200% 100%;
  animation: flow 2.4s linear infinite;
}
.blank.filled {
  color: var(--green);
  font-weight: 600;
  border-color: var(--green);
  background: rgba(43, 255, 163, .1);
  animation: none;
}
.feedback-block .cloze { margin: 8px 0 0; font-size: 1rem; background: transparent; border-color: var(--line); }

.answer-line {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  background: #03060a;
  color: var(--text);
  caret-color: var(--cyan);
  font-size: 1.1rem;
  transition: border-color .2s, box-shadow .3s;
}
.answer-line:focus { border-color: var(--cyan); box-shadow: var(--glow-cyan); outline: none; }
.answer-line:disabled { opacity: .7; }

.org-tag {
  display: inline-block;
  margin: 0 0 8px;
  padding: 2px 10px;
  border: 1px solid rgba(0, 229, 255, .45);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--cyan);
}

.sr-only {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

.fb-context { border-color: rgba(124, 92, 255, .35); }
.fb-context h3 { color: #b3a2ff; }
.fb-context p { margin: 0; }
.home-head h1, .sheet-title, .score-line { letter-spacing: -.02em; }